[linux.git] / include / linux / gpio.h

#ifndef __LINUX_GPIO_H
#define __LINUX_GPIO_H

/* see Documentation/gpio.txt */

/* make these flag values available regardless of GPIO kconfig options */
#define GPIOF_DIR_OUT	(0 << 0)
#define GPIOF_DIR_IN	(1 << 0)

#define GPIOF_INIT_LOW	(0 << 1)
#define GPIOF_INIT_HIGH	(1 << 1)

#define GPIOF_IN		(GPIOF_DIR_IN)
#define GPIOF_OUT_INIT_LOW	(GPIOF_DIR_OUT | GPIOF_INIT_LOW)
#define GPIOF_OUT_INIT_HIGH	(GPIOF_DIR_OUT | GPIOF_INIT_HIGH)

/**
 * struct gpio - a structure describing a GPIO with configuration
 * @gpio:	the GPIO number
 * @flags:	GPIO configuration as specified by GPIOF_*
 * @label:	a literal description string of this GPIO
 */
struct gpio {
	unsigned	gpio;
	unsigned long	flags;
	const char	*label;
};

#ifdef CONFIG_GENERIC_GPIO
#include <asm/gpio.h>

#else

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/bug.h>

struct device;
struct gpio_chip;

static inline bool gpio_is_valid(int number)
{
	return false;
}

static inline int gpio_request(unsigned gpio, const char *label)
{
	return -ENOSYS;
}

static inline int gpio_request_one(unsigned gpio,
					unsigned long flags, const char *label)
{
	return -ENOSYS;
}

static inline int gpio_request_array(const struct gpio *array, size_t num)
{
	return -ENOSYS;
}

static inline void gpio_free(unsigned gpio)
{
	might_sleep();

	/* GPIO can never have been requested */
	WARN_ON(1);
}

static inline void gpio_free_array(const struct gpio *array, size_t num)
{
	might_sleep();

	/* GPIO can never have been requested */
	WARN_ON(1);
}

static inline int gpio_direction_input(unsigned gpio)
{
	return -ENOSYS;
}

static inline int gpio_direction_output(unsigned gpio, int value)
{
	return -ENOSYS;
}

static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
{
	return -ENOSYS;
}

static inline int gpio_get_value(unsigned gpio)
{
	/* GPIO can never have been requested or set as {in,out}put */
	WARN_ON(1);
	return 0;
}

static inline void gpio_set_value(unsigned gpio, int value)
{
	/* GPIO can never have been requested or set as output */
	WARN_ON(1);
}

static inline int gpio_cansleep(unsigned gpio)
{
	/* GPIO can never have been requested or set as {in,out}put */
	WARN_ON(1);
	return 0;
}

static inline int gpio_get_value_cansleep(unsigned gpio)
{
	/* GPIO can never have been requested or set as {in,out}put */
	WARN_ON(1);
	return 0;
}

static inline void gpio_set_value_cansleep(unsigned gpio, int value)
{
	/* GPIO can never have been requested or set as output */
	WARN_ON(1);
}

static inline int gpio_export(unsigned gpio, bool direction_may_change)
{
	/* GPIO can never have been requested or set as {in,out}put */
	WARN_ON(1);
	return -EINVAL;
}

static inline int gpio_export_link(struct device *dev, const char *name,
				unsigned gpio)
{
	/* GPIO can never have been exported */
	WARN_ON(1);
	return -EINVAL;
}

static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
{
	/* GPIO can never have been requested */
	WARN_ON(1);
	return -EINVAL;
}

static inline void gpio_unexport(unsigned gpio)
{
	/* GPIO can never have been exported */
	WARN_ON(1);
}

static inline int gpio_to_irq(unsigned gpio)
{
	/* GPIO can never have been requested or set as input */
	WARN_ON(1);
	return -EINVAL;
}

static inline int irq_to_gpio(unsigned irq)
{
	/* irq can never have been returned from gpio_to_irq() */
	WARN_ON(1);
	return -EINVAL;
}

#endif

#endif /* __LINUX_GPIO_H */
Commit	Line	Data
7560fa60 DB	1	#ifndef __LINUX_GPIO_H
	2	#define __LINUX_GPIO_H
	3
	4	/* see Documentation/gpio.txt */
	5
c001fb72 RD	6	/* make these flag values available regardless of GPIO kconfig options */
	7	#define GPIOF_DIR_OUT (0 << 0)
	8	#define GPIOF_DIR_IN (1 << 0)
	9
	10	#define GPIOF_INIT_LOW (0 << 1)
	11	#define GPIOF_INIT_HIGH (1 << 1)
	12
	13	#define GPIOF_IN (GPIOF_DIR_IN)
	14	#define GPIOF_OUT_INIT_LOW (GPIOF_DIR_OUT \| GPIOF_INIT_LOW)
	15	#define GPIOF_OUT_INIT_HIGH (GPIOF_DIR_OUT \| GPIOF_INIT_HIGH)
	16
feb83699 MB	17	/**
	18	* struct gpio - a structure describing a GPIO with configuration
	19	* @gpio: the GPIO number
	20	* @flags: GPIO configuration as specified by GPIOF_*
	21	* @label: a literal description string of this GPIO
	22	*/
	23	struct gpio {
	24	unsigned gpio;
	25	unsigned long flags;
	26	const char *label;
	27	};
	28
7560fa60 DB	29	#ifdef CONFIG_GENERIC_GPIO
	30	#include <asm/gpio.h>
	31
	32	#else
	33
3d599d1c	34	#include <linux/kernel.h>
6ea0205b DB	35	#include <linux/types.h>
6ea0205b DB	36	#include <linux/errno.h>
187f1882	37	#include <linux/bug.h>
6ea0205b	38
a4177ee7	39	struct device;
4e4438b8	40	struct gpio_chip;
a4177ee7	41
3474cb3c	42	static inline bool gpio_is_valid(int number)
7560fa60	43	{
3474cb3c	44	return false;
7560fa60 DB	45	}
7560fa60 DB	46
d8a3515e	47	static inline int gpio_request(unsigned gpio, const char *label)
7560fa60 DB	48	{
	49	return -ENOSYS;
	50	}
	51
323b7fe8	52	static inline int gpio_request_one(unsigned gpio,
5f829e40 WS	53	unsigned long flags, const char *label)
	54	{
	55	return -ENOSYS;
	56	}
	57
7c295975	58	static inline int gpio_request_array(const struct gpio *array, size_t num)
5f829e40 WS	59	{
	60	return -ENOSYS;
	61	}
	62
7560fa60 DB	63	static inline void gpio_free(unsigned gpio)
7560fa60 DB	64	{
3d599d1c UKK	65	might_sleep();
3d599d1c UKK	66
7560fa60 DB	67	/* GPIO can never have been requested */
	68	WARN_ON(1);
	69	}
	70
7c295975	71	static inline void gpio_free_array(const struct gpio *array, size_t num)
5f829e40 WS	72	{
	73	might_sleep();
	74
	75	/* GPIO can never have been requested */
	76	WARN_ON(1);
	77	}
	78
d8a3515e	79	static inline int gpio_direction_input(unsigned gpio)
7560fa60 DB	80	{
	81	return -ENOSYS;
	82	}
	83
d8a3515e	84	static inline int gpio_direction_output(unsigned gpio, int value)
7560fa60 DB	85	{
	86	return -ENOSYS;
	87	}
	88
c4b5be98 FB	89	static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
	90	{
	91	return -ENOSYS;
	92	}
	93
7560fa60 DB	94	static inline int gpio_get_value(unsigned gpio)
	95	{
	96	/* GPIO can never have been requested or set as {in,out}put */
	97	WARN_ON(1);
	98	return 0;
	99	}
	100
	101	static inline void gpio_set_value(unsigned gpio, int value)
	102	{
	103	/* GPIO can never have been requested or set as output */
	104	WARN_ON(1);
	105	}
	106
	107	static inline int gpio_cansleep(unsigned gpio)
	108	{
	109	/* GPIO can never have been requested or set as {in,out}put */
	110	WARN_ON(1);
	111	return 0;
	112	}
	113
	114	static inline int gpio_get_value_cansleep(unsigned gpio)
	115	{
	116	/* GPIO can never have been requested or set as {in,out}put */
	117	WARN_ON(1);
	118	return 0;
	119	}
	120
	121	static inline void gpio_set_value_cansleep(unsigned gpio, int value)
	122	{
	123	/* GPIO can never have been requested or set as output */
	124	WARN_ON(1);
	125	}
	126
d8f388d8 DB	127	static inline int gpio_export(unsigned gpio, bool direction_may_change)
	128	{
	129	/* GPIO can never have been requested or set as {in,out}put */
	130	WARN_ON(1);
	131	return -EINVAL;
	132	}
	133
a4177ee7 JN	134	static inline int gpio_export_link(struct device dev, const char name,
	135	unsigned gpio)
	136	{
	137	/* GPIO can never have been exported */
	138	WARN_ON(1);
	139	return -EINVAL;
	140	}
	141
07697461 JN	142	static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
	143	{
	144	/* GPIO can never have been requested */
	145	WARN_ON(1);
	146	return -EINVAL;
	147	}
a4177ee7	148
d8f388d8 DB	149	static inline void gpio_unexport(unsigned gpio)
	150	{
	151	/* GPIO can never have been exported */
	152	WARN_ON(1);
	153	}
	154
7560fa60 DB	155	static inline int gpio_to_irq(unsigned gpio)
	156	{
	157	/* GPIO can never have been requested or set as input */
	158	WARN_ON(1);
	159	return -EINVAL;
	160	}
	161
	162	static inline int irq_to_gpio(unsigned irq)
	163	{
	164	/* irq can never have been returned from gpio_to_irq() */
	165	WARN_ON(1);
	166	return -EINVAL;
	167	}
	168
	169	#endif
	170
	171	#endif /* __LINUX_GPIO_H */